Test JS script file

Selected file: 051null_comparison.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 001syntax_unicode.js
  2. 010number_DecToHex.js
  3. 011number_HexToDec.js
  4. 012number_toExponential.js
  5. 013number_modulo.js
  6. 014number_division_by_zero.js
  7. 015number_NaN.js
  8. 016number_infinity.js
  9. 017number_isFinite.js
  10. 018number_isNaN.js
  11. 019number_negative_zero.js
  12. 020number_float_rounding_error.js
  13. 030string_htmlTags.js
  14. 030string_multiline.js
  15. 031string_length.js
  16. 032string_concatenate.js
  17. 032string_concatenate2.js
  18. 033string_minus.js
  19. 035stringmethods_charAt.js
  20. 035stringmethods_concate.js
  21. 035stringmethods_indexOf.js
  22. 035stringmethods_match.js
  23. 035stringmethods_match_memory.js
  24. 035stringmethods_replace.js
  25. 035stringmethods_search.js
  26. 035stringmethods_split.js
  27. 035stringmethods_toString.js
  28. 035stringmethods_toUpperCase.js
  29. 035stringmethods_trim.js
  30. 036string_regexTest.js
  31. 040bool_falsy.js
  32. 040bool_truthy.js
  33. 041bool_comparison.js
  34. 042bool_conditional_operator.js
  35. 043bool_logic_operators.js
  36. 044bool_not_exe_function.js
  37. 050null_typeof.js
  38. 051null_comparison.js
  39. 053undefined_var.js
  40. 054ReferenceError.js
  41. 055global_object_browser.js
  42. 055global_object_node.js
  43. 056global_properties_browser.js
  44. 056global_properties_node.js
  45. 057wrapper_object.js
  46. 058wrapper_object_readonly.js
  47. 60object_reference.js

..:: Source code - 051null_comparison.js ::..

/**
 * comparison of null and empty string
 */

console.log(Boolean('' == null)); //false
console.log(Boolean('' === null)); //false
console.log(Boolean(0 === null)); //false
console.log(Boolean({} === null)); //false
console.log(Boolean({} == null)); //false

console.log('--------------');

var x = null;
if (!x) {
 console.log('x is null');
} else {
 console.log('x is not null');
}
 

..:: NodeJS Console - 051null_comparison.js ::..

$ node 051null_comparison.js 
false
false
false
false
false
--------------
x is null

$ps -aux | grep node (list all node processes)
sasa         831  0.5  0.4 1303612 78760 ?       Ssl  Jun15 150:32 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         843  0.5  0.6 11698500 104360 ?     Ssl  Jun15 149:04 node /home/sasa/dex8/dex8-api/starter.js
sasa         858  0.3  0.4 1304640 73176 ?       Ssl  Jun15 114:43 node /home/sasa/regoch/regoch-www/server
sasa         867  0.3  0.4 1300556 68640 ?       Ssl  Jun15 107:35 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         886  0.7  0.6 11845768 109056 ?     Ssl  Jun15 225:00 node /home/sasa/dex8/dex8-www/server/index.js
sasa         888  0.5  0.4 11792580 78236 ?      Ssl  Jun15 158:55 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         904  0.7  0.5 1329652 82188 ?       Ssl  Jun15 211:01 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         910  0.3  0.4 1300384 70020 ?       Ssl  Jun15 108:24 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         969  0.3  0.3 1297720 64484 ?       Ssl  Jun15 107:11 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         970  0.6  0.5 11799288 89088 ?      Ssl  Jun15 195:49 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1010  0.6  0.6 1147316 103244 ?      Ssl  Jun15 181:17 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1016  0.8  1.1 11901948 186036 ?     Ssl  Jun15 235:28 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1086  0.4  0.4 11794656 77904 ?      Ssl  Jun15 116:24 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1089  0.3  0.3 1099356 65464 ?       Ssl  Jun15 109:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1159  0.3  0.4 22277180 77372 ?      Ssl  Jun15 112:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1160  0.3  0.3 1099356 63984 ?       Ssl  Jun15 109:56 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1241  0.3  0.3 1100952 63196 ?       Ssl  Jun15 110:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1242  0.4  0.4 22280936 81132 ?      Ssl  Jun15 116:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1323  0.3  0.3 1099100 63040 ?       Ssl  Jun15 110:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1324  0.3  0.3 1099616 63796 ?       Ssl  Jun15 109:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1398  0.3  0.3 1099104 63400 ?       Ssl  Jun15 110:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1400  0.3  0.3 1099612 64304 ?       Ssl  Jun15 110:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1465  0.3  0.3 1098848 63032 ?       Ssl  Jun15 110:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa      178968  0.8  0.5 11811112 97384 ?      Ssl  Jun17 211:26 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      337381  1.2  1.4 1471548 242676 ?      Ssl  Jun19 281:21 node /home/sasa/crypto/dex-arbitrage-bot/scripts/observer/index2
www-data 1463038  0.0  0.0   2608   604 ?        S    02:45   0:00 sh -c ps -aux | grep node
www-data 1463040  0.0  0.0   3304   732 ?        S    02:45   0:00 grep node